Hi alicia, the clicking noise after you push the horn is a solenoide engaging which means this part of the circuit is ok.... you say you tried 12v directly to the horn and sounded like it tried to work once but still didn't honk. that tells me the problem, is with the horn. some horns in older cars have an adjusting screw, some-where on the side . if yours doesn't have one then apart from pulling the horn apart (if its screwed together as a lot of older ones are) buy a second hand horn....(note i have had this problem in the past and adjusting the screw in or out has fixed it .... there was a lock nut on the screw as well) hope this helps.... pete...
SOURCE: Horn stopped working
HORN CIRCUIT RUNS THROUGH AIRBAG "CLOCKSPRING". THIS CLOCKSPRING IS A ROTATING DEVICE THAT HAS A SPIRAL CABLE INSIDE THAT FLEXES AS YOU TURN THE STEERING WHEEL. THE PROBLEM AFFECTS THE CRUISE CONTROL SOMETIMES AND THE AIRBAG LIGHT MAY STAY ON ALSO. ONE OR MORE FUNCTIONS MAY BE AFFECTED OR JUST A SINGLE CIRCUIT(HORN). THE PROBLEM AREA WILL BE FROM THE STEERING WHEEL DOWN(MOST LIKELY THE CLOCKSPRING) HAVE YOUR DEALERSHIP RUN THE VIN NUMBER THROUGH THEIR SYSTEM AND SEE IF THERE ARE ANY RECALLS CONCERNING THIS. HOPE THIS HELPS YOU!!
SOURCE: 2005 sierra horns stopped working.
The click you hear is the horn relay -- this likely has either dirty / corroded connections or burned contacts inside the relay. If cleaning all relevant connections doesn't solve the problem, replace the relay. You can find the realy by having someone push the horn button while you track down the click.
Charlie
SOURCE: 2005 toyota corolla horn doesn't work
You can replace the horn. Check to see if the wires connected to the horn have power. Check with a test light. If power is present then the horns are bad.
SOURCE: 2004 Chevy Tahoe, Horn doesn't work.
The button on you steering wheel is the problem, try to open it up and pull the spring just a little bit. I think you have used it too much ;)
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